body {
  background-color: white;
  color: black;
}

.app {
  width: 450px;
  margin: 0 auto;
  padding-top: 50px;

  & .app-header {
    height: 250px;
    width: inherit;
    object-fit: cover;
  }

  section {
    border: 1px solid red;
    ul {
      li {
        border: 1px solid green;
      }
    }
  }
}